What's the view if you own the ccTLDs but, for cost, strategy and other reasons are using sub-domains with content mirroring, and you then choose to 301 the ccTLD to the appropriate content mirrror home page.

Is there any search advantage to be gained in using the ccTLD in this way?

As an example, IBM use ccTLDs but redirect back to a central site: ibm.de --> ibm.com/de/de